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CN-122000491-A - Electrode assembly, secondary battery, and method for manufacturing electrode assembly

CN122000491ACN 122000491 ACN122000491 ACN 122000491ACN-122000491-A

Abstract

An electrode assembly, a secondary battery, and a method for manufacturing the electrode assembly are disclosed. The electrode assembly includes a first electrode including a first substrate and a first composite portion on the first substrate, a second electrode including a second substrate and a second composite portion on the second substrate, a first separator between the first electrode and the second electrode, and a winding core having a through hole, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate includes a winding direction uncoated portion exposed from the second composite portion, and wherein at least a portion of the winding direction uncoated portion is at a periphery of the through hole.

Inventors

  • LIN BINGHUI
  • ZHAO XIANHAO
  • FU CHONGZHI

Assignees

  • 三星SDI株式会社

Dates

Publication Date
20260508
Application Date
20250908
Priority Date
20241105

Claims (19)

  1. 1. An electrode assembly, comprising: a first electrode including a first substrate and a first composite portion on the first substrate; a second electrode including a second substrate and a second composite portion on the second substrate; A first separator between the first electrode and the second electrode, and A winding core having a through hole, Wherein the second substrate extends in the longitudinal direction of the second electrode, the second substrate includes a winding-direction uncoated portion exposed from the second composite portion, and Wherein at least a portion of the winding-direction uncoated portion is at a periphery of the through hole.
  2. 2. The electrode assembly according to claim 1, wherein the winding-direction uncoated portion and the first separator are stacked on the periphery of the through-hole in a diameter direction of the electrode assembly.
  3. 3. The electrode assembly of claim 1, wherein: the first electrode is on the outer surface of the first diaphragm, and The second electrode is on an inner surface of the first diaphragm.
  4. 4. The electrode assembly of claim 1, further comprising a second separator between the first electrode and the second electrode, wherein the second separator is on an outer surface of the first electrode.
  5. 5. The electrode assembly according to claim 4, wherein the winding-direction uncoated portion, the first separator, and the second separator are stacked on the periphery of the through hole in a diameter direction of the electrode assembly.
  6. 6. The electrode assembly of claim 4, wherein at least a portion of the second separator is located on an outer surface of the electrode assembly.
  7. 7. The electrode assembly of claim 4, wherein: The winding front end of the first diaphragm contacts the second diaphragm, or The winding front end of the second diaphragm contacts the first diaphragm.
  8. 8. The electrode assembly of claim 1, wherein: the winding front end of the winding direction uncoated portion contacts the first diaphragm, or The winding front end of the first separator contacts the winding direction uncoated portion.
  9. 9. The electrode assembly of claim 1, wherein the first separator and the winding-direction uncoated portion are between an inner surface of the second electrode and an outer surface of the first electrode.
  10. 10. The electrode assembly of claim 4, wherein: the second separator, the first separator, and the winding-direction uncoated portion are between an inner surface of the second electrode and the outer surface of the first electrode, and The second diaphragm is of a double-layer structure.
  11. 11. The electrode assembly according to claim 4, wherein a winding front end of the first separator, a winding front end of the second separator, and a winding front end of the winding-direction uncoated portion are between the outer surface of the first electrode and an inner surface of the second electrode.
  12. 12. A secondary battery, comprising: the electrode assembly according to any one of claims 1 to 11, and A case configured to accommodate the electrode assembly.
  13. 13. The secondary battery according to claim 12, further comprising a lead tab connected to the at least a portion of the winding-direction uncoated portion at the periphery of the through hole.
  14. 14. The secondary battery according to claim 12, further comprising an interposed current collector including a flat portion contacting the electrode assembly and a protrusion protruding from the flat portion and inserted into the through-hole, Wherein the protruding portion of the inserted current collector is electrically connected to the second electrode by contacting the winding direction uncoated portion.
  15. 15. The secondary battery according to claim 14, wherein a height of the protrusion is greater than half a height of the electrode assembly and less than the height of the electrode assembly.
  16. 16. The secondary battery according to claim 12, wherein: the housing includes an insertion portion formed by bending a portion of one surface of the housing toward the inside of the housing to be inserted into the through hole, and The insertion portion of the case is electrically connected to the second electrode by contacting the winding-direction uncoated portion.
  17. 17. The secondary battery according to claim 16, wherein a height of the insertion portion is greater than half a height of the electrode assembly and less than the height of the electrode assembly.
  18. 18. A method for manufacturing an electrode assembly, the method comprising: preparing a first electrode including a first substrate and a first composite portion on the first substrate; preparing a second electrode including a second substrate and a second composite portion on the second substrate; Providing a separator between the first electrode and the second electrode, and Winding the first electrode, the second electrode and the separator, Wherein the second substrate extends in the longitudinal direction of the second electrode, the second substrate includes a winding-direction uncoated portion exposed from the second composite portion, and Wherein a winding front end of the winding-direction uncoated portion contacts the separator, or a winding front end of the separator contacts the winding-direction uncoated portion.
  19. 19. The method of claim 18, further comprising inserting an insertion rod into a through hole in a winding core of the electrode assembly.

Description

Electrode assembly, secondary battery, and method for manufacturing electrode assembly Technical Field Embodiments include an electrode assembly and a secondary battery including the same. Background Unlike primary batteries, which are not designed to be (re) charged, secondary (or rechargeable) batteries are batteries that are designed to be discharged and recharged. Low-capacity secondary batteries are used for portable small-sized electronic devices such as smart phones, function phones, notebook computers, digital cameras, and video cameras, and large-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing electric power (e.g., electric power storage at home and/or utility scale). The secondary battery generally includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. The above information disclosed in this background section is for enhancement of understanding of the background of the present disclosure and, therefore, it may contain information that does not form a related (or prior) art. Disclosure of Invention Embodiments include an electrode assembly including a first electrode including a first substrate and a first composite portion on the first substrate, a second electrode including a second substrate and a second composite portion on the second substrate, a first separator between the first electrode and the second electrode, and a winding core having a through hole, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate includes a winding direction uncoated portion exposed from the second composite portion, and wherein at least a portion of the winding direction uncoated portion is at a periphery of the through hole. The winding-direction uncoated portion and the first separator may be stacked at the periphery of the through hole in a diameter direction of the electrode assembly. The first electrode may be on an outer surface of the first diaphragm and the second electrode may be on an inner surface of the first diaphragm. The electrode assembly may further include a second separator between the first electrode and the second electrode, wherein the second separator is on an outer surface of the first electrode. The winding-direction uncoated portion, the first separator, and the second separator may be stacked on the periphery of the through hole in a diameter direction of the electrode assembly. At least a portion of the second separator may be located on an outer surface of the electrode assembly. The wound front end of the first diaphragm may contact the second diaphragm, or the wound front end of the second diaphragm may contact the first diaphragm. The winding front end of the winding-direction uncoated portion may contact the first separator, or the winding front end of the first separator may contact the winding-direction uncoated portion. The first separator and the winding-direction uncoated portion may be between an inner surface of the second electrode and an outer surface of the first electrode. The second separator, the first separator, and the winding-direction uncoated portion may be between an inner surface of the second electrode and the outer surface of the first electrode, and the second separator may be a double-layer structure. The winding front end of the first separator, the winding front end of the second separator, and the winding front end of the winding-direction uncoated portion may be between the outer surface of the first electrode and the inner surface of the second electrode. An embodiment includes a secondary battery including an electrode assembly including a first electrode including a first substrate and a first composite portion on the first substrate, a second electrode including a second substrate and a second composite portion on the second substrate, a separator between the first electrode and the second electrode, and a winding core having a through hole, and a case configured to accommodate the electrode assembly, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate includes a winding direction uncoated portion exposed from the second composite portion, and wherein at least a portion of the winding direction uncoated portion is at a periphery of the through hole. The winding-direction uncoated portion and the separator may be stacked at the periphery of the through hole in a diameter direction of the electrode assembly. The secondary battery may further include a lead tab connected to the at least a portion of the winding direction uncoated portion at the periphery of the through hole. The secondary battery may further include an interposed current collector including a flat portion contacting the electrode assembly and a